| Steffen Zesner | |
| Fullname: | Steffen Zesner |
| Nationality: | (until 1990) |
| Strokes: | Freestyle |
| Club: | SC Dynamo Berlin SC Berlin |
| Birth Date: | 28 September 1967 |
| Birth Place: | Herzberg (Elster), Brandenburg, East Germany |
| Height: | 1.85 m |
| Weight: | 80 kg |
Steffen Zesner (born 28 September 1967) is a former freestyle swimmer from Germany, who won a total number of four medals as a relay member at the Summer Olympics. His best result was a silver medal, on the 4×200 metres freestyle, alongside Uwe Dassler, Thomas Flemming, and Sven Lodziewski in Seoul, South Korea. He swam for SC Dynamo Berlin and its successor SC Berlin.